If you are in need of a render of a planet quickly you can simply open up the .blend file, change the desired parameters and press render for a unique planet. But if you are in need of a planet in your very own project I would recommend appending the planet object into your scene to import all materials and system correctly. 

This system only works inside Cycles! 

Where are the parameters?

• Planet material - Shader editor (for more control open the node group and change the sub-groups)

• Atmosphere - Shader editor

• Clouds - Shader editor 

• Planet geometry control - Modifiers tab

Release - 2022-11-24: Procedural Planet 1.0